Android 连接web service

public ArrayList<String> GetWebServre(String methodName, ArrayList<String> Parameters, ArrayList<String> ParValues) {
        ArrayList<String> Values = new ArrayList<String>();

        //ServerUrl是指webservice的url
        //10.0.2.2是让android模拟器访问本地（PC）服务器，不能写成127.0.0.1
        //11125是指端口号，即挂载到IIS上的时候开启的端口
        //Service1.asmx是指提供服务的页面
        String ServerUrl = "";

        //String soapAction="";
        String soapAction = "" + methodName;
        //String data = "";
        String soap = ""
                + ""
                + "";
        String tps, vps, ts;
        String mreakString = "";

        mreakString = "<" + methodName + " xmlns=\"\">";
        for (int i = 0; i < Parameters.size(); i++) {
            tps = Parameters.get(i).toString();
            //设置该方法的参数为.net webService中的参数名称
            vps = ParValues.get(i).toString();
            ts = "<" + tps + ">" + vps + " + tps + ">";
            mreakString = mreakString + ts;
        }
        mreakString = mreakString + " + methodName + ">";
        /*
        +""
        +"string11661"
        +"string111"
        + ""
        */
        String soap2 = "";
        String requestData = soap + mreakString + soap2;
        //System.out.println(requestData);

        try {
            URL url = new URL (ServerUrl); //指定服务器地址
            HttpURLConnection con = (HttpURLConnection) url.openConnection();//打开链接
            byte[] bytes = requestData.getBytes ("utf-8"); //指定编码格式，可以解决中文乱码问题
            con.setDoInput (true); //指定该链接是否可以输入
            con.setDoOutput (true); //指定该链接是否可以输出
            con.setUseCaches (false); //指定该链接是否只用caches
            con.setConnectTimeout (6000); // 设置超时时间
            con.setRequestMethod ("POST"); //指定发送方法名，包括Post和Get。
            con.setRequestProperty ("Content-Type", "text/xml;charset=utf-8"); //设置（发送的）内容类型
            con.setRequestProperty ("SOAPAction", soapAction); //指定soapAction
            con.setRequestProperty ("Content-Length", "" + bytes.length); //指定内容长度

            //发送数据
            OutputStream outStream = con.getOutputStream();

            outStream.write(bytes);
            outStream.flush();
            outStream.close();

            //获取数据
            InputStream inStream = con.getInputStream();

            //data=parser(inStream);
            //System.out.print("11");
            Values = inputStreamtovaluelist(inStream, methodName);
            //System.out.println(Values.size());
            return Values;

        } catch (Exception e) {
            System.out.print("2221");
            return null;
        }
    }